ControlType is an option for Manipulate and related functions that specifies what type of controls should be displayed.
CovarianceEstimatorFunction is an option for generalized linear model fitting functions that specifies the estimator for the parameter covariance matrix.
CriticalSection[{var_1, var_2, ...}, expr] locks the variables var_i with respect to parallel computation, evaluates expr, then releases the var_i.
Cubics
(Built-in Mathematica Symbol) Cubics is an option for functions that involve solving algebraic equations, that specifies whether explicit forms for solutions to cubic equations should be given.
DegreeGraphDistribution[dlist] represents a degree graph distribution with vertex degree dlist.
Element
(Built-in Mathematica Symbol) Element[x, dom] or x \[Element] dom asserts that x is an element of the domain dom. Element[{x_1, x_2, ...}, dom] asserts that all the x_i are elements of dom. Element[patt, ...
EventLabels is an option to CandlestickChart, KagiChart, and similar functions that specifies events to labels.
FaceGrids is an option for three-dimensional graphics functions that specifies grid lines to draw on the faces of the bounding box.
FourierParameters is an option to Fourier and related functions that specifies the conventions to use in computing Fourier transforms.
FrameTicksStyle is an option for 2D graphics functions that specifies how frame ticks should be rendered.